DRC
SCIENCE: a body of knowledge obtained through systematic observations, subject to replication and falsification of tests.

    Scientific Method
    Systems
    Models

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SCIENTIFIC METHOD (key properties)
  • observation (instruments, reading)
  • testing (controlled & natural)
  • hypothesis (explanation, [speculation {reasoning}])
  • "A tentative educated guess" (readings p.6)
    vs. examples "Why?"
    • theory
    • law
  • prediction: comes from hypothesis

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SCIENTIFIC METHOD (characteristics)
  • objective (quantitative, measurement)
  • open to discussion & criticism (publication)
  • repeatable (publication)
  • testable (falsifiable)

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Hypothesis
  • Atm. CO2 conc. controls plant growth
  • Arizona's draught is due to global warming
Theory
  • Germ Theory of Disease
  • Theory of Relativity
Law
  • Sandwiches always land jelly-side down
  • Newton's First Law of Motion


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SCIENTIFIC METHOD

Hypothesis: a tentative explanation for observations or experimental data [click] Literature, Instrumental Measurements, Controled Laboratory Experiments [click] Explore implications of Hypotheses (tests) [click] example: Newton's Laws of Motion [click] example: Theory of Relativity [click] use cursor to explore image

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CONTROLLED TESTS
    (water, CO2)

NATURAL TESTS
    Tikal was abandoned due to drought 800 ya

[1] [2] [3] [4]

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QUANTITATIVE MEASUREMENT

  • Accuracy: how well a measurment matches the "true" value
  • Precision: how closely repeated measurements agree




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Systems and Models

SYSTEM: a set of components that function together in a potentially predictable manner. Types: simple, complex, open & closed systems

    input / output

      flows, fluxes (arrows)

        components, storage (boxes)


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What is a MODEL?

A representation of a system that can be used to simulate the system to generate and test hypotheses about how the system works (many examples).






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